tmp = [0.1965
    0.1965
0.2276
0.2595
0.2930
0.3089
0.3373
0.3604
0.3578
0.3511
0.3768
0.3759
0.3739
0.3752
0.3804
0.3898
0.3805
0.3998
0.3958
0.3958] ;

year_rr = [1940
    1965
1970
1975
1980
1985
1990
1995
1998
1999
2000
2001
2002
2003
2004
2006
2011
2012
2015
2016];

timevec_rr = 1940:1:2070 ;

rr_vec = interp1(year_rr', tmp', timevec_rr','linear','extrap') ;